Automatic trip for two-way plow



Oct. 27, 1953 w. F. MELLEN 2,656,774I

AUTOMATIC TRIP FOR TWO-WAY PLOW Filed Aug. 16, 1948 3 Sheets-Sheet lOct. 27, 1953 w, F, MELLEN 2,656,774

AUTOMATIC TRIP FOR TWO-WAY PLOW Filed Aug. 16, 1948 3 Sheets-Sheet 2Oct. 27, 1953 w. F, MELLEN AUTOMATIC TRIP FOR Two-WAY PLow 5Sheets-Sheet 5 Filed Aug. 1e, 1948 Patented Oct. 27,

UNITED STATES PATENT OFFICE William Fisk Mellemwhittiec, Calif.,1assi`gnor to lAlice Marian Mellen, Whittier, Calif.

l Application August '16, 194s', serial No. 44,483

(ci. .9i- 29) 22 Claims. 1

This invention relates toa earthworking implements of the 'typecoin-rnonly known as two-way plows which are adapted tofbe drawn bytractors having automatic power li'ft apparatusicontained therein forthe purpose of l`ifting the plows from the ground being tilled;

Two-way plow Vstructures provide oppositely pitched plows which areadapted to be selectively raised and lowered, `and are hereinA referredto as plow bottoms, one plow bottom being lowered when plowing across afield one direction, and the other plow bottom being lowered forV thepurpose of plowing across the iield immediately alongside the previouslyformed furrow',f whereby all furrows will be turned in the jsainedirection Without the necessity of following the old practice oftravelling around the unplowed periphery of the field and progressing inever narrowing loops toward the center to keep adjacent furrows turnedin the vsame direction.

' A particular object of the present improvement is to provide novelmeans under the control of the tractor driver for producing automaticshift of the plow bottoms through the medium of the power lift means onthe tractor whereby to reverseV the plow beams asA may' be required inconnection with any earthworking `operation.`

Another object of the invention is to provide in a two-way plowstructure means for interconnecting the two plow bottoms incounterbalanced relationshipso that an actuating means may beshifte'dlby the tractor driver toenergi'ze lifting means. for one plowfbottom while freeing lifting means for the other plow bottom andallowing such other plow bottom to descend wit-h'- out interference.

A further object of the invention is to provide transversely movablemeans which may be readily and selectively moved from one position `toanother for selectively energizing the merrtioned energizing means asrequired and to neutralizeV said action when desired.

A still further object of the invention is to provide locking means foreach of the plow bottoms so that the respective plow bottom may be helddownin operative position,l meansfbeing employed in conjunction withsuch locking means, upon energiza'tion of the mentioned' lifting means,so that initial movement under the influence of` such lifting means willrelease the locking means.

It is still anadditional object of theinvention to provide means forlocking the descending plow bottom in operative position under influenceof the iinalportion of the downward movement thereof.

.2 An additional object of the invention is-7to pro'- vid'e a nove-1frame construction and arrangement! for mounting plow bottoms so thatthey may be easily assembled upon said frame and may" be easily adjustedfrom side to side with respect to one another andv may also be easilyadjusted to direct the toe` of each plow bottom as maybe best suited fortheparticula-r soil being cultivated.

Itisalso anobect of the invention to provide a plow structure employingtwo-way plow bot'- toms wherein means may be laterally shifted upon thementioned frame structure for selectively energizing the lifting `of therespective Vplow bottom through the rising and falling movements of Vthe`plow bottoms themselves.

The subject matter herein disclosed but not claimed is being 'claimed inthe continuationin-partapplication Serial Nol 175,082, .iiled` July2.1.1950.

Other objects, and the various features of the invention will becomeapparent to those skilled inithi's artupon reference to the followingspecic'ati'on and the accompanying 'drawingsfwheree in 'certainembodiments of the invention are illustrated;

In `the drawings:

Fig.` l is a side elevation of a two-way plow structure having two plowbottoms; one ofthe plow botton'isbeing` in lowered, loperative positionand the other one in elevated,` inoperative position; the unit beingmounted upon the rear of a tractor .provided with a conventional powerlift device;

Fig. 2 is principally a rear elevation taken from theline 2&2 of Fig. 1,some of the parts being indicated in section;` A

Fig. 3 isavertical sectional detail as indicated by the line 3-3 of Fig.l;

Fig. 4: is a fragmentary side elevational detail as indicated by theline A-L of l'ig-` 2i;

Fig.` 5 is a fragment of the structure shown in Fig. 4 and indicates` adifferent operative position-of the parts;`

Fig. 6 is a transverse sectional and elevational view takenapproximately from the line 6-6 of Fgnii liigi. 7 is an elevational viewsimilar` to that ofllig. 1 showing a construction providing a modinedform of latch operating means;

Fig. 8V is a perspective view of the structure shown in Fig. '7

Fis; 9 is a side e1evaticna1view similar to that of Figs. 1f and 7 andshowing a still further form of latch operat'ingm'e'ans;

Fig. is principally an elevational view as indicated by the line Ill- IDof Fig. 9;

Fig. 11 is a cross section taken from the line Il-ii of Fig. 10;

Fig. 12 is an enlarged sectional detail, parts being shown in elevation,of the latch operating means of Fig. 10; and

Fig. 13 shows a modified form of mounting for the pull link of Fig. 9.

Each of the forms of construction illustrated in the drawings comprisesprincipally a box frame, generally indicated at B, which in somerespects substitutes for a Vso-called A-frame frequently employed withthis type of equipment, a plow assembly generally designated as P andcornprising two ccunterbalanced, oppositely pitched plow bottoms, apower lift mechanism generally indicated at L and carried by therearward end of a tractor generally represented at T, and an actuatingand control linkage generally indicated C.

The box frame B is supported at its lower end by a pair of spacedlifting arms whose forward ends are pivotally attached by appropriatepivots 2| to the lower side portions of a rear housing 22 constituting aportion of the body of the tractor '.I. The opposite or rearward ends ofthe lifting arms 25 receive the ends of stub shafts 23 which laterallyproject from the lower side portions of the box frame B, this assemblybeing maintained by cotter keys, or otherwise as desired. The liftingarms 20 are controlled by pull rods 2li which are actuated by crank arms25 through the medium of universal joints 2S, said arms 25 beingconventionally aifixed to and actuated by a bell crank shaft 21 whichprojects through the tractor housing 22 and is in turn operated byhydraulic mechanism (not shown) contained within the housing 22. Thecrank arms 25, the shaft 21 to whose opposite ends the arms 25 areattached, and the hydraulic apparatus within the housing 22 comprise thepower lift L which is a well known construction forming no part of thisinvention and, therefore, will not be further disclosed. The upper endof the box frame B is maintained in a required vertical position throughthe medium of a positioning bar connected to an upper portion of theframe B as by a pivot bolt 3|, passed through ears 31a, on the frame B,the opposite end of the bar 3G being connected to the housing 22 of thetractor T by means of a triangular plate 32 whose lower corner ismounted by a pivot 33 upon the housing 22. The rearward upper corner ofthe plate 32 is pivotally connected with the forward end of thepositioning bar 33 and the other upper corner of the plate 32 ispivotally connected with a power lift control rod 34 which extendsforward into an upper continuation of the housing 22 (not shown) whereit serves to regulate flow of hydraulic power uid to the power lift L ina well known manner.

The form of box frame B illustrated comprises two opposed, verticallypositioned side members 35 whose lower extremities carry the stub shafts23 by which the frame B is supported upon the lifting arms 20. The upperends of the side members 35 are connected by a top cross bar 35a, andthe lower ends of the side members 35 may be connected by a bottom crossbar 35h. The cross bars 35a and 35bare rigidly aixed to the members 35,thereby producing a rigid unitary construction of the box frame B.Extending transversely above the cross bar 3517 and near the lower endsof the side members 35 is a horizontal mounting shaft 3c and above theshaft 36 a ered for ditching purposes.

4 short distance is a second horizontal mounting shaft 31. The ends ofthe shafts 35 and 31 are affixed in the side members 35 of the frame B,the shaft 35 being set closer to the forward edges of the side members35 than is the shaft 31 which is set somewhat nearer the rearward edgesof the side members 35. The mounting shafts 38 and 31 serve to mount theforward ends of two spaced plow beams 35, this being accomplishedthrough the medium of a plurality of mounting devices generallyindicated at 33 and presently to be described. The rearward ends of theplow beams 38 carry conventional plow bottoms 45 secured thereto in anyconventional manner and respectively pitched in opposite directions.Thus,

two oppositely disposed plow unith are providedV so that, when the plowstructure P is being drawn in a given direction, one plow bottom 40 willturn a furrow to one side and the other plow bottom 4c will turn afurrow to the other side, according to which plow unit is raised andwhich plow unit is lowered. The bottoms 40 are also adapted for loweringat the same time so that they may function simultaneously and produce aditch as they are drawn forward.

For the purpose of lowering one plow bottom While the other is beingraised, the two plow bottoms s3 are interconnected by a flexible cable4I whose ends are appropriately engaged, preferably adjustably, in eyes42 provided on rearward portions of the respective plow beams 38, themiddle portion of the cable 4l passing through a pulley i3 carried upona post 44 or similar mounting which is removably retained in a socket 45or the like xed on the middle of the top cross bar 35a on the box frameB, and rigidly secured thereto and to the ears 31a which position therearward end of the positioning bar 30. By detaching the post dii fromthe socket i5 or equivalent mounting, both plow bottoms :lc may be low-To provide for adjustment of the length of the cable 4| as may berequired, at least one end of the cable is provided with a removable oradjustable clamp device 4E.

For the purpose of mounting the plow bottoms 40 so that they may beraised and lowered, the forward ends of the plow beams 38 are providedwith laterally projecting pivot pins 50 received in eyes 52 mounted onthe ends of eye bolts 53. In the form illustrated, the outer ends of theeyes 52 are closed to form sockets in which the ends of the pivot pins5B are received. There being an eye bolt 53 at earch side of each plowbeam 39, several bolts 53 are required to be mounted for proper supportof the plow beams 38 and the plow bottoms 40. For this purpose, four ofthe previously mentioned mounting devices 39 are employed Iand these arelocated in pairs for respectively receiving the eye bolts 53. Eachdevice 39 is in the form of a vertically disposed elongated block 54having a vertical, slightly arcuate slot 55 which receives therespective eye bolt 53. The ends of the eye bolts 53 are threaded andare adjustably bound into position in the slots 55 of the blocks 54 bymeans yof nuts 5B disposed on opposite sides of the blocks 54. Byshifting the eye bolts 53 slightly in the slots 55 the plow beams 38 maybe shifted about their axes yand the pitch of the plow bottoms 40 variedas required. Similarly, the relative effective lengths of the eye bolts53 between the blocks-f54 and their eyes 52 may 'be adjusted to vary theangular direction of the plow beams 38 yas necessary. As best seen inFig. 1, the blocks 54 of assuma :the mounting devices 41359`.aresomewhat 'JL-shaped,

and `their upper .and :lower ends tare fsnugly, but slidably, tted uponthe `upper and A'lower mounting shafts '3.1 and 136 `through the mediumof transversely arranged eyes 51. rl'fhese parts are assembled before`the sllafts and 31ers mounted on thev box frame B. The spacing of thetwo `plow bottoms` it from .each other isireadily accomplished by`.sliding the mounting blocks V54 along the shafts `3B :and V31 asrequired, and the pivot `pins `5l) of the plow .beams .38 .are readilypositioned by shifting one of the blocks 5'4 of each pair with respecttothe other. Properly adjusted positioning of the lmountingibloclrs154is maintained by means .of set screws 58 which bind the respective eyes51 upon the upper mounting shaft 31, yasbest illustratedin'F-ig. 2.

In order to lift the respective .plow vbottoms 40, each plow bottom isprovided with a pull bar 60 whose lower and rearward end is connected by-1 a pivot pin 6| to an ear 52 attached to arearward portion of therespective plow beam 38. Each pull bar .60 may .be a Vsingle bar offixed length as indicated in Fig. 2 and 'at the left vof Fig. l, or itmay be in two sections adjustably connected `as by bolts and slots asindicated `at l63 in Figs. l, '7, 8 fand 9. The upper forward end ofeach pull bar 50 is attached by a pivot pin 64 between ears Gld-formedon rearward upper Vedge portions of a bifurcated swinging control oractuating arm 65 whose lower end is pivoted .on the `lower mountingshaft 36 bymeans of a transversely positioned hub 56. Thus, theseswinging arms 65 serve to position the respective pivot pins 54 landalso the upper and forward ends of the respective pull bars L60.

When each plow bottom 40 is in its lowered, operative position as seenin Fig. 1i, the upper end of its swinging 'arm 65 engages at itsrearward edge portion against the forward face of a transverse retentionbar or lock bar 68 against which it is held by a latch 1l) mounted upona pivot 1| between the upper ends of the Vbifurcations of the respectiveswinging yarm 65. The rearward end of each latch 10 haswan overhanginglatch finger 10a; as best seen in- Fig. 4, this fingerv maintaining thelocking relationship of the latch 10 with the barili. Sincethe ends ofthe lock bar 68 are rigidly secured, as by welding, to the side membersof the box frame B; the latch 10 insures proper penetration of therespective plow bottom into the soil. Moreover, since each pull bar 60is rigid, it falso serves as a brace barwhich prevents upward swingingmovement of the respective plow bottom 40 during plowing and `so long asthe latch 1D is in locking position.

As best indicated in Figs. Zand 8, each swinging actu-ating arm G5 isdisposed substantially in the same vertical plane as the respective plowbeam 38 by Ireason of the fact that the respective hub B6 is positionedbetween and fills the space between the lower eyes 51 ofl the respectivepair of mounting blocks 54 :carried on the upper and lower mountingshafts 36 and 31.

Each swinging arm 65 is connected with :a pull link 12 whose forward endis pivotally secured by a pivot pin 13 to a corresponding energizing andpositioning .arm 14, these parts comprising together with the swingingarm 65 and its pull bar BD the principal members of the actuating andcontrol linkage C above mentioned. The upper ends of the positioningarms 14 `for the two pull links 12 are pivoted upon a transverse shaft15 carried in the upper ends of brackets 16 fboltedfor otherwise secured.atftheirfforwardedges tothe adjacent rear housing/ofthe tractor Tsuch:attachment.beingrgenerallyiindicated.at11. Intl-ie form shown, `spacers18 (Fig. 39 are mounted upon the outer ends 'of the shaft 15 and thesemay be relied upon for lateral adjustment of the .positioning arm 14 andthe pull link T2 1in ac- .cordance with lateral adjustment of the4mount-- ing blocks 54` on the mounting shafts 36 and 31 .to vary .thespacing of the plow beams and their plow bottoms 40.

Raising of ithe lowered vplow bottom 4'0 from .itsioperating posi-tionas illustrated .in Fig. l, while permitting lowering of the elevatedplow bottom .40 Vthrough the counterbalancing action of #the Vcable 41,isl effected by the raising of the box from Bthrough the agency of thepull rods 24 and the lifting .arms 2U when the bell crank sha-ft 21xandtheicrank arms 25 are hydraulically actuated under the control of thetractor driver by `conventional meansin the rear -housing 22 connected4with the power lift mechanism L. Thus, -as` the box frame B is raised byelevation 4ofthe rearward ends of the lifting arms 20, the connection ofthe swinging arm 65 for the lowered plow bottom 40 with the respectivepull link 1=2 tends totpull the upper and rearward end of the `pull link1'2 upward and thereby swing the elfec- .tive positioning arm 174 aboutits pivotal mounting on the transverseshaft '15 without producing anylifting eifect upon the respective plow bottom 4D. On the other hand,when the elevated Aplow bottom 40 is descending while the box` frame Bis being raised, it is necessary that its pull link 1.2 and energizingand, positioning arm 1 tbe permitted to move. In order to care for theseselective movements a draw vbolt 80, best illustrated in Fig. 3,istransversely mounted inthe lowerporftions of the brackets 16`iso thatits ends may be selectively slid laterally into the path of the lowerendV of. the respective positioning arm 14 and` out of the path of theother arm 1-4. Slid`- ing movement of the draw bolt is limited by asleeve .8 I l xed on the middle portion thereof and positioned so thatthe end of the draw bolt 3-0 being drawn froml the path of one of thearms 14 is not ventirely withdrawn from its seat in the respectivebracket 1B, as illustrated. Means are provided for the purpose ofshifting the draw bolt 80, and in the form shown this includes an eye 82fixed on the middle of the'sleevell, the eye 82 having secured theretothe endsof two cables -83 which are then passed' through guiding eyes8'4 preferably anixed to the rigid brackets 1B. The cables 83 (or othermeans used) extend to a position convenient to the operator of thetractor so that he may pull the' respective cable 83` and therebyshiftthe draw'bolt 3'0- into the path of the positioning arml14lwhosemovementis to be prevented.

According to the form of? construction of Figs. 1 to 6, each pulllink 12is directly connected to the respective swinging arm 65. Accordingto theform of Figs. 7 and 8; there is a pull link 12 for each of the swingingarms- 65, but indirect connection is provided, this occuring through thelatch 10. In the form ofFigs'. 9lto 12, a single pull link 12. isemployed and this operates through fthe medium of'a single rock armcooperating with the two swinging arms B5 in a manner-present- 1y tobedescribed. In each of these forms, the latches. 111|` are actuated bydifferent means as also will be described.

Having reference first to the form of Figs. 1 to 6 inclusive, therearward and upper end of accenni the link l2 in each instance isprovided with an Velongated lost-motion slot 83 which receives atransverse guiding and actuating pin 90 upon which is mounted pivotallythe lower end of a latch operating control arm or trip arm 92, the upperend of the arm 92 being attached by a pivot pin 93 to the heel portionof the latch 10 at a position forward of the upper end of the respectiveswinging arm 65. Inasmuch as the latch operating trip arm 92 must bemoved up and down for the purpose of actuating the latch 10, thenecessary guided movement is provided by angularly positioned arcuateslots 94 formed in the bifurcations of the respective swinging actuatingarm 65, as best illustrated in Figs. 4 and 5. In order that the movementof each actuating pin in its slot 94 may be properly guided and smooth,a short block 95 is in each instance provided between the bifurcationsof the respective swinging arm 65, and each block 95 is mounted upon apivot 96 located at the center about which the arcs 94 are described.Thus, as the actua=ting pins 90 move in the slolts 94, the blocks 95insure against any tendency to bind. Axial shift of the pins 99 isprevented by any appropriate means, such as the indicated heads at oneend of the pins and the cotter keys at the other end.

From the foregoing, it will be apparent that, when the box frame B isbeing elevated and the respective pin 96 is brought to the rear end ofthe respective slot 88 in the corresponding pull link 12, there is aresultant draft upon the respective pin 90 causing it to move downwardin its slot 94. Such downward movement pulls the respective latchoperating trip arm 92 downward and rocks the respective latch 'l0 aboutits pivot pin I, thereby withdrawing the respective latch finger a frombehind the lock bar 68 so as to release the swinging arm 65 from thelock bar 68. As a consequence, further elevation of the box frame Bunder the influence of the pull rods 24 and the lifting arms 20 causesdraft to be transferred through the respective pin 90 'to thecorresponding swinging arm 65, whereby the lowered plow bottom 40 iselevated by means of the respective pull bar 60. Such elevation of thelowered plow bottom 40, of course, requires that the draw bolt 80 bepreviously moved inlto position to block swinging movement of therespective positioning arm 'i4 as hereinbefore de scribed. In orderproperly to align the latch operating trip arm 92, its pivort pin 93 ismounted in a laterally offset boss 91 integral with the heel of therespective latch 10. Each arm 92 may be loaded by a spring 98 forautomatic return thereof and of its latch '10.

From the foregoing it will be apparent that as the box frame B of theform of Figs. l to 6 is elevated through the medium of the lifting armsand the pull rods 24 from the power lift L, the draw bolt 80 being inoperative position as indicated, the transverse guiding and actuatingpin 90 will first be brought into the end of the slot 86 of therespective pull link 12 for that plow bottom 40 which is in loweredposition, whereupon further draft by the pull link 12 will pull theactuating pin 90 downward in the arcuate Fig. l, and the plow beam 36for the respective plow bottom 40 will be elevated through the medium ofthe respective pull bar 60. At the same time, the other plow bottom 40will have descended by gravity in synchronism with the elevation of theone plow bottom 40 by reason of the counterbalancing cable 4|. Inpractice, the last portion of the descent of the plow bottom which isbeing lowered takes place solely under influence of gravity, and withoutthe necessity for further elevation of the box frame B and consequentpull by the respective pull link 12, such nal portion of the descentoccurring by reason of the overbalancing of the descending plow bottomnear the end of its movement, the center of gravity of the ascendingplow bottom then moving in close to the vertical plane of the point ofsupport provided by the pivot pin 50 and eyes 52.

The location of lthe bolt 89 as seen in Fig. l, and also in Fig. 7, issuch as to provide for a limited amount of swinging movement of the re'-spective positioning arms 14 from their most forward position and duringinitial elevation of the box frame B as the lower plow is beingwithdrawn from the soil. However, should it be desired to eliminate suchlost motion for any purpose, a hole 99 is provided in the respectivebracket 'I6 just behind the forwardmost position of the respectivepositioning arm 14, and

Vsuch hole 99 may receive any type of looking pin corresponding ingeneral nature to the bolt 80.

In the form of the invention shown by Figs. 7 and 8, the latches 10 areoperated by latch operating and control trip arms |02 instead of thelatch operating arms 92 of the other form. Each trip arm |032 isprovided at its lower end with a hub |03 which is swingingly mountedupon the lower transverse mounting shaft `36 between the hub 66 of theadjacent swinging arm 65 and the lower eye 57 of the adjacent mountingblock 54. Affixed to one side of each latch operating arm |02 is anactuating pin |04 (Fig. 8) which is located about the same distanceabove the lower transverse mounting shaft 36 as are the actuating pinsand slots 94 of the other form. Each actuating pin |04 is positioned inthe slot 68 of the corresponding pull link 12. Thus, when the box frameB is elevated and the pin |04 in each instance is brought into the outerend of the pull link 12, the pull link 12 tends to swing the latchoperating or trip arm |02 from an upright position alongside theadjacent upstanding swinging arm 65 toward an inclined position such asindicated at the left of Fig. 8. When a plow bottom 40 is in lowered,operative position and its swinging arm 65 is upright, a catch in theform of a laterally extending lug I|l2av on the upper end of therespective latch operating arm |02 engages behind an upstanding shoulder|05 on an upper, somewhat forward portion of the respective latch 10.Thus, with the draw bolt 89 behind the respective positioning arm 74whereby to energize and cause the respective pull link 12 to becomeeffective, resultant draft upon the actuating pin |04 causes therespective lug |025 to pull against the upstanding shoulder and lift thelatch nger 10a of the latch 10 from behind the lock bar 68 so that theswinging arm 65 can swing forward upon its hub 66. Such swinging of thelatch 'I0 upon its pivot pin 1| is limited by a stop |06 provided on theforward, lower heel portion of the latch T0 and extending laterallytherefrom to engage with the forward edge portions of the bifurcationsof the aaneen.

respectiveswineing arm 65. Assoon as .the..r e-,`

spective stop |06 contacts such` edge. portions..

sition already assumed. by the other swinging` arm |554 for the otherplow beam` 38. Thus, the

shoulder |05, whenoperatedby. thelug |02a. on.

plow beamA 3B andr plow bottom 40 until raisingf of; the respective.plowv bottom Mlfhasbeen` conipleted` andthe other plow.' bottom. hasvbeen. low-4 ered'toits operative position. During the last portion ofsuch movement, wherein descent. of such` other plow bottomV to operativeposition is being completed by. gravity, the lug` |02ct` of thedescending latch operating arm |02 may be dis-,- engaged fromthe'descending latch 'wand corre,n spondingshoulder |05, this beingpermitted by appropriatecurvature of thetop ofthe latch as illustrated.In any event, when the box frame B is being lowered tobring the lowered`plow botv tom- 40. intov operative position in the soil, the wallat/ther inner end ofv the slot 08` in thev ren spective` pull link 12may exert a holding or pushing effect upon the actuating pin |04 andforces the corresponding latch operating arm |02 anditsv lug |02avupward approximately to the angular position of such arm |02illustrated. in both of Figs. '7` andv 8. The arm |02 is subsequentlyrestored to a vertical position upon raising of the respective latch 1.0and its actuating arm |55,` when the corresponding plow bottom islowered. Eig. 7 is representative of a partially lowered relationship,and the above-mentioned` holding or pushingl eifeet, which, takesplaceduring continued lowering,` results from engagementof the positioningarm 14 withthe tractor,

housing 22,01', the securing. bolt 1.1., or, when the throw of the. link'|2 is small, by engagement of the positioning arm '|4 with thepreviously` mentionedpin placed. in the hole 39 of the bracketl. Thusthelinks 1,2 may betermed push-pull mem.- bers. Subsequently, when therespective plowv beam30 and itsplow bottom140 are lowered, the rising ofthe respective. swinging. arm 65 will cause the shoulder 1.0.5.0r therespective latch `10. to engage the corresponding lug [02o and. returnthe parts to. the upright position` illustrated, whereupon`the-respective overhanging finger 10a, will; drop into locking position`behind the lock bar 68j.. This operation may be assured by springloading each latch 10., but ordinarily momentumv of the respective,moving latch-operating arm.

|52 will be sufficient to press down the latch rin,- ger 'maas the topof the corresponding swinging arm` 65 bumps intothe lock bar 68 at the`end.

ofthe descending movement of the respective plow. bottom. This nalmovement issharp and theinertia of the arm |02 is adequate for thepurpose..

These operations may all b e repeated to reverse` the plow bottoms byshifting the draw bolt` 80 to theopposite side.

When a plow bottom` 4 0' is down. inoperative position and its latch 10.is locked behind the lock bar 68, such plow bottom is held down in,

proper operative position by reason ofthe fact that4 the respectivepullbafr-*Sll now operates asa.

brace bar maintaining' the desired relationship. Similarly, if thepositioning post 44 for the pul ley 43l which positions the4 bightportion of the.

will? then be, locked. downinr operative position sothat a. ditchmay beIformed, the two plow bottoms throwing earthV in opposite directionssimultaneously. This same result may be accomplishedLwith thestructure,of Figs. 1 to 6, and

itmay also .be produced by the structure of Figs.`

Thestructure,illustrated' in Figs. 9 to 12 employs the sameplow. beams38, plow bottoms40, box. frame B, transverse mounting shafts 36 and 3l.,eye bolts 5.3, mounting blocks. 54, pulley 43, and swinging arm 654 asin the other form. However, inthis instance` only. two mounting blocks54g are employed and two eye bolts 53, and in conjunction with these asingle transverse mounting pin or pivot pin 50a (Fig. '11,), isused to.support theY plow beams 38, the hub portions 38a being sufliciently wideto fillthe intervening spacebetweenthe eyes 52 ofthe eye bolts. Withthis form of'the invention, instead' of` employing two latch operatingand control` arms, such as the arms` |02 ofthe form of Figs. rland 8,.asingle hollow latch-operating` control arm or trip armv ||0. isemployed, this arm having a hub |0a (Fig. 10'.) rockingly mounted uponthe lower. transverse supporting shaft 3B. The arm |I0 is adapted to beshifted along the shaft36 by cams ||2, formed on theinner endsof thehubs 66 of the swinging arms` 65 betweenpthe. position shown in Fig.A 10andA a. corresponding position somewhat tov the, left thereof and at theopposite side of the vertical median line` of` the box frame B;

Such shifting is accomplished by engagement of.`

opposite sides of. the latch operating arm Uil,`

catchesA or trips and are selectively engageable` with theY upstandingshoulder |05 of the two latches T0 on the upper ends ofthe two swing,-ing arms 65. Such selective engagement, is

brought about by the shifting of the arm I0 by-` the cams ||2 so thatone end of the cross head |15 is moved into the pathof one of theshoulders |05 andthe opposite end is Withdrawn from the path ofthe othershoulder 05. The cross head I5 is rigidly carried upon the upper end ofa vertical stem |16 which istelescopically mount,-`

ed in` theV arm ||0. Asbest illustrated in Fig. 11the stem ||6 issquare, the arm` I I0 is likewise square and is also hollow to receivethe stem H6. Theobject in making the stem ||6 telescope is to permit thecross. head H51 to be ele,-

vated above the shoulders4 |05 when necessary,`

andj as hereinafter explained.

With the construction of Figs. 9 to l2,v a single push-pull link Il isemployed in the place; of

the two links 12 of the other forms, and the rea-r` ward. and upper end.of, this link is pivotally attached as by apivot pin` |'8 to ears |20,on

the forward face of the arm ||0-. The forward andv lower end ofthevpulllink is pivotally attached as by a pivotpin |2| to thelower end ofna swinging energizing and positioning arm |22,

corresponding with the positioning arm 14 andpivotedat |23 on theupperendofibracketmeans |24 corresponding with the bracket means 'I6 lof the other forms but sufficiently offset to one side of the tractorhousing 22 that the link IIl and its positioning arm I 22 may besuitably centered. In this case a shiftable bolt 80a is provided in thebracket means |24 to correspond with the draw bolt 80 used in the formsof Figs. 1 to 8. When it is desired to elevate the box frame B withoutshifting the plow bottoms 40, the bolt 80a is withdrawn, but when it isdesired to shift the plowV bottoms 40, the bolt 80a isV moved intoposition behind the control arm |22 so that the pull link I I'I will beeective to pull down the upper end of the latch operating arm IIII asthe box frame B is elevated by the power lift L through the medium ofthe pull rods 24 and the lifting arms 20. Thus, with this form if thebolt 80a is left in engaging position, the changing of theplow'bottomsbecomes automatic upon each excursion of the box frameV B. The sameresult is accomplished with the modification of Fig. .13 where the pivot|2|a for the push-pull link I |'I is fixed in the bracket |24.

Should it be desired at any time to hold the positioning and energizingarmr|22 against the tractor housing 22, for example to hold one of theplow bottoms 4|) in slightly elevated position, the arm |22 may beshifted into the indicated position and locked therein, as by means of across pin mounted in holes 99a corresponding with the holes 99previously described. Again, such a cross pin may be mounted in theholes 99a Vto limit such forward movement of the lower end of thecontrol arm |22 for the purpose of forcing Vthe upper end of the latchtripping orcontrol the vertical position of the latter, it is necessarythat the cross head I I5 be permitted to rise and ride over the curve ofthe respective shoulder |05 Y of the corresponding latch 10. This ispermitted bythe telescopingof the stem i I in the square, hollow latchoperating arm Ill). Such elevation of the cross head I I 5, is indicatedby the broken line position'in Fig. 12. In order to insure return of thecross head I toitsV full line operative position, springs |25 may berelied upon, these springs having their upper ends attached to ears |26projecting frompthe stem H0 through slots |2`| Figj12) inthe hollow arm-I I Il, the lower.

ends of the springs |25 being attached to Vlugs I 28 projecting from thesides of the arm I I0 The Y springs |25 also serve as spring loadingmeans whichrcause the vertically disposed or operating latch 'I0 and itslatch finger 10a to engage behind thelock bar 68 as indicated in Fig. 9.Otherwise,

the latches 10 may be spring loaded in any conventional manner to forcethem into locking This cammeans |30 isreceived in a rectangular.,

opening |32 through the stem IIi-.V Thus, rota',- tion of the cam meansI30Ycauses one end thereof to bear against the upper wall of the opening|32 and thereby raise and hold the stem I I6 and its cross head I |5 inthe broken line position. Inasmuch as each swinging arm 65 is drawnforward by the cross head ||5 through the agency of the respective latch'I0 and its shoulder |05, the Vheel of each latch is provided with thesame stop I0 as employed in the form of Figs. 7 and 8.

Y Operation The operation of the various forms of the invention hereindisclosed has been generally outlined in connection with the foregoingdescrip-- tions of the constructions. To reoapitulate, when: it isdesired to raise the lowered plow bottom 40 of the form of Figs. l to 8from its illustrated.

operative position, whereby to lower the opp0" sitely pitched plowbottom 40, the draw bolt 8U is shifted laterally by the correspondingcable 83' to bring thecorresponding end of the draw bolt into positionbehind the respective positioning. arm '14. The tractor driver thenoperates the manual control for the power lift mechanism L so that thepull rods 24 and the lifting arms 20 function to elevate the box frameB, In view of the location of the pivot pins 'I3 at the'forward andlower ends of thepull links '|2, the tendency Vis for the pivot pins I3to swing rearward about their mountings on the transverse pivot shaft15. However, one end of the draw bolt 80Vwi1l have been moved behindthat positioning arm I4 con-A nected with the pull link I2 for thelowered plow bottom 40. As a consequence, the pull link I2 isv held sothat the actuating pin is soon broughtV into the outer end of the slot88 in the pull link l2 for the respective plow bottom. Thus, the,

latch operating arm or trip arm 92 attached thereto and as a consequencerock the respective latch 10 about its pivot pin 'II and withdraw theoverhanging latch iinger Illa from behind the lock bar 68, therebyreleasing the top of the swinging arm 65 from the box frame B. Y

Continued elevation of the box frame B causes continued draft upon theactuating pin Sii and the respective swinging arm @5 so that the upperend of the latter is gradually pulled downward from its upright positioninto the lower Vposition illustrated in Fig. 1. Since the plow bottomsare counterbalanced, only a small weight is required to be lifted andtherefore, only a limited pull is exerted through the link 12..Meanwhild the other plow bottom willhave been allowed to descendthrough theV medium of the counterbalancing cable 4 VI, and its swingingarm 65 and latch 'IiiV will have risen. As previously indicated,'thelast of the plow change will be rather rapid due to the gravity effectsproduced by the overbalancing of the descending plow bottom 40. YThus,ordinarily it will be unnecessary to pull the actuated swinging arm 65all the way downto the 1 illustrated lower position which itassumesSince the rismgswinging arm $5 is vnot Vunder I control of its pull linkI2 and positioning arm 14, by reason of the fact that' therespecuve endof the draw bolt 80 does not project into the path of such arm '14, suchswinging arm 65 is returnedV Y freely to its upright position as itsplow bottom 40 descends. Ifo insure engagement` of the re-` spectivelatch 10 over the lock barrBB, `eachlatc-h 10 or its operating arm 92 isspring loadedf as by the spring 918 indicated in Fig. 1'. When it isagain desired to reverse the-position ofthe p1owubot. toms 40, thedrawbo1t80 is shifted in the-opposite direction, and es: a consequence,actuationofthe power lift L will reverse the. above d'escribedhoperation,

However, should it benot desired to changethe plowson any givenexcursion-of the box frame B, the vdraw bolt 80 will be left inits`positicm ofthe preceding operation and will not be shifted. Thus, thelink 'I2 and arm M of the lowered `plow bottom will' not be energized,and the other link 'l2 will not be effectivebecause its plow `bottom isalready in raised position.

When operating the structure of Figs. 7 and' 8, the draw bolt 80 isshifted as before, and when the power lift L is energized by the tractoroper ator, initial pull of the pull link '|12`1for thelowered plowbottom 40 operates upon the actuating pin |04 to swing forward the upperend of the respective latch operating arm |102 whose top lug |02aengages against the shoulder HlEA or therespective `latch T0, therebylifting the latch finger 10a from behind the `lock Vbar 584 and freeingthe respective swingingarm- 65. Further movement upward of thebox frameB causes the same rel ative motion oi the respective swinging, arm 65accomplished when the respective plow bottom 40 is lowered fromelevated; position shown in Eig. 7 to the ylowered position shown inFig.4 8; Such lowering takes place Aby gravity under. the controlof theinterconnecting cable lH as the lowered plow bottom 40- is being raisedfrom the lowered position to the raised position under the pullingyaction ofthe pull link 12, latch-operating arm |102 and swingingactuating. arm 65 for the plow bottom which is'being raised. As therising swinging arm 65 reaches the lug `llla. of the operating arm |02,the latch 'l0 on the `rising arml 65 passes `under the lug |02a untilthe latter is struck by the shoulder `|05 ofthe latch Continued downwardmovement of the descendingplowl bottom under influence of gravity causesthe respective swinging arm |55, its latch l0 andy the respective arm|02 to move up into verticall Vposition until` the` lock bar 68, isstruck and the latch finger 10a drops down into latchi'ng positionbehind the lock bar lt8".

In operating the modicat-ion shown inFigs. 9-to l3l, wheny the draw bolt80u isyin` the operative position lillustrated in 9, or when the fixedpivot |2f|a of Fig. lis usedfor the liril:r |'|"|`L elevation ofthe boxframe -B by the power lift E results in the pull link I-l drawingthelatch operating arm H0 forwardin-an arc about the. lower supportingshaft 36= by reason of the pull ofthe respective end of' the trippingcross head` H5 against the shoulder |05 of the respective latch l0, theinitial swinging movement of the cross head ||5 servingto release thelatch finger lila., and thev following portion of the movement operatingto-raise the lowered plowbottom 40 through the respective pull bar 60;as in the other forms, and-.by reason ofthe connection of theupper endof: the pull bar 00| to the respective swinging arm 05. The` oppositeplow bottom 40l and ltsswingingarm. simultaneously moveto.` theiroperative positionsby `reascm of: theintereonnection by thecounterbalancing cable 4|. When it is; necessary for thelatch operating:arm lil-0 to be returned to itsxupright. positional-iter the risingswinging `arm E5' has `risen beyondA the position of the latch operatingarm H0.; the cross headl ||'5 willrise up over the .rounded `shoulder|05 of the respective latch. "tu against the tension of the springs |25.Aitor reaching its normal or upright position,` the springs [25 willpull the oros-s head 5 down into position behind the shoulder |05 of thelatch 'I0 on the upstanding swinging arm 65 and positively latch it in,position behind the lock bar BB.

It willy be apparent that, when the latch operating arm .tite is inverticalposition the cam |`|2 on 'the swinging .arm 65 ofthe elevated:plowfbottom 410 will have shifted the latch operatingarm i;t in theopposite direction so that the opposite end of the cross` head ||5 liesin the path of the shoulder .|f'05.' of the latch 'l0` on the otherswinging varm '65, and that the 'cam |12 on the descending plow bottomt0: will have clearedithe respective boss ||z3 on the latch operatingAarm |113V so `that `the latter can be shifted later by the cam l |2onthe otherswingingarm 6-5. Thus; as the swinging `arms 65 are raisedand lowered they automatically shift .the latch operating arm H50 vback.and forth to shift the cross4 head1 H155 tol and from the paths of. therespective latch shoulders |595.

In all forms of the invention herein disclosed, thetwo mounting shafts.35 andS-T and the slid'- able mountingblocksV '54 provide for eifectsnot heretofore possible in vtwo-way plow structures, and as aconsequence they impart much greater flexibility in such devices thanheretofore` pos sible, More specifically, these mounting shafts and.blocks make it possible to adjust in the field the relative positionsof the plow bottoms for whatever purpose, andi they also. make it simple`to replace the plow bottoms with those of larger or smallerdinrensons.

Thus, by loosening the nuts 56 on the eye bol-ts 53, the bolts may bemoved' up or down in the arcuate slots 55 for the purpose of levellingthe plovvhottoms tofaccord with given plowing condii tions. Adso, thenuts 56 may be adjusted lalong the eye bolts 53 to vary the effectivelengthsA of .the eye bolts of' each pair so as to change the position ofthe toe or point of the respective plow bottom andV thereby change thelead to shift the. point t0. the right or left and thereby correct `forover or under cutting, and consequently adjust side draft. Again, uponloosening of the set screws 58V of the respective mounting blocks 54,theblocks may be. slid along theshafts 36 and 31 either for the purposeof spacing the bottoms already installed', or for replacing them withwider oy-narrower:bottoms Thus, with the presentimprovement, variouswidths of plow bottoms from 1 0` inchesito L8- inches in width,orgreater', may be. used. In a structure adapted for max imum plowbottom widths of l8finches, the inner block 54 of each pair willbe-shifted over approximately to the median line of the .box framez B',

`and the respective plow bottoms` 40 installedV as previously described.If 16 inch plow bottoms are used, the blocks are shifted sor that theinnerblock of each pair is located about two inches outward along theshafts 30 and 31., and inthe case of 10 inch plow bottoms the blocksmight be shifted outwardl as much as eight inches from the middle.` Allof these adjustments are quickly accomplished with the mountings ofthepresent improvement.

Such easyV adjustment with the plow bottom 15 mountings also makes itpossible to eliminate the common shifting of tractor wheels to vary thetread when two-way plows are to be used. As is familiar to every tractorand plow operator, the moving or reversing of tires and wheels ontractors to accommodate different plows is a very tedious operation,especially when it is considered that in many tractors the wheels areheavily loaded and may weigh as much as 1090 pounds apiece. It istherefore a great advantage to be able to avoid this heavy work merelyby loosening the set screws 58 and sliding the plow beams along theshafts 35 and 31 to required positions.

In connection with the above mentioned adjustment of the lead of thepoints of the plow bottoms, the adjustments by shifting of the nuts 56on the eye bolts 53 are quickly accomplished in the eld. If the givenplow bottom is cut- Vting too narrow a swath, the shifting of the pointof the plow bottom is thus quickly attained, thereby presenting agreater width of effective cutting edge to the soil. Again, if the plowbottom is over cutting, and thereby causing excessive side thrust orside draft to be exerted against the plow bottom, its point may beeasily shifted. Similarly, the plow bottoms may be quickly levelled byraising or lowering the eye bolts 53 in their slots 55. By reason of thefact that the mounting blocks 54 may themselves be adjusted to shift theplow beams 38 and their plow bottoms, this avoids the necessity forattempting to accomplish similar results by excessive adjustment of thelead of the plow points. Also, the plow beams may be easily broughttogether when they are both iowered Vfor ditching purposes.

VFrom the foregoing, it will be apparent that Vthenpresent box frameconstruction makes it possibleV to employ a single frame structure forVmany different plow bottoms, and also eliminates the necessity ofreversing the tires and wheels of the tractor when changing from onetype or size of plow or other tool to another. Y Y

Since other modications of the generic invention hereindisclosed willoccur to those skilled in this art, it is intended to protect allvariations which fall within the scope of the patent claims. Y I claimas my invention: Y

1. In combination in a plow structure: a frame adapted to be supportedin upright position by a tractor power lift mechanism; a transversesupporting shaft carriedby said frame; a plow beam having pivotalmounting upon said supporting shaft and adapted to swing in a verticalplane, said plow beam carrying a plow bottom to be raised and loweredtherewith; a second transverse supporting shaft carried by said frame; a

swinging arm mounted upon said second shaft and having operativeconnection with said beam and said plow bottom for elevation thereof;lock means carried by said frame; latch means carried by said arm andadapted to cooperate with said lock means for locking said plow beam andbottom in operative position; pull means adapted ing interconnectedwhereby one plow bottom descends as the other plow bottom is raised.

2. In combination in a plow structure: a frame adapted to be supportedin upright position by a tractor power lift mechanism; a transversesupporting shaft carried by said frame adjacent its lower end; a plowbeam having pivotal mounting upon said supporting shaft and adapted toswing in a vertical plane, said plow beam carrying a plow bottom to beraised and lowered therewith; a second transverse supporting shaftcarried by said frame adjacent the other transverse shaft; a swingingarm mounted upon said second shaft and having operative connection withsaid beam and said plow bottom for elevation thereof; and pull meansadapted to be connected to said tractor and having a continuing pivotalconnection with said swinging arm to swing said arm and plow beam onsaid shafts.

3. A combination as in claim 2 including mounting means movably carriedupon both of said transverse shafts, one of said shafts being disposedat an elevation above the other, said plow beam being pivotally mountedupon said mounting means. Y

4. In combination in a two-way plow to be drawn and supported by atractor: a pair of oppositely pitched plow bottoms; plow beamsrespectively carrying said plow bottoms; an upstanding frame; means forsupporting said frame upon a tractor for automatic raising and loweringof the frame by a power lift on the tractor; a pair of paralleltransverse supporting shafts Vmounted in the lower portion of'saidframe; plural mounting means mountable on said shafts, each mountingmeans being movably Vmcmnted on both of said shafts; meansswinginglyattaching said plow beams to said mounting means; and. meansfor swinging said beams and their plow bottoms on saidV mounting means.

5. In combination an earthworking structure: an upstanding frame; meansfor supporting said frame upon a tractor for automatic raising and.lowering of the frame by a power lift on the tractor; a pair of paralleltransverse supporting shafts mounted in the lower portion of said frame;plural mounting means mountable on said shafts, each mounting meansbeing mounted on both of said shafts; and earthworking tools mountedupon said mounting meansV and including rearwardly extending beam means,said` mounting means including adjusting means for varying the angularposition laterally of said beam means to adjust side draft of theearthworking tools.

6. In combination in a plow: an upstanding frame havingY means adaptedfor Vsupporting said frameupon a tractor for automatically raising andllowering the frame by a power lift mechanism on the tractor; a plowunit; a pair of paralto be connected'tos'aid tractor and having pivotalv connection with said swinging arm; latch operating means connectingsaid pull means with said latch means; and a second plow beam providedwith a second oppositely pitched plow bottom, said Vlatchoperating-means being an arm mounted on lel, transverse supportingshafts mounted in the lower Yportion of `said frame; a plurality` ofmounting blocks each of which is movably mounted upon each of saidshafts for lateral movement therealong; and means carried by said blocksand mounting said plow unit thereupon for swinging movement in verticaldirections between elevated and lowered positions.

7. An earthworking structure comprising in combination: a supportadapted to be mounted upon an elevationally controlled draft connectiono f a vehicle having a powerlift to impart verti- V'cal movements tosaid support, said support in- `cluding a vertical frame, two:horizontal bars mounted in Vsaid frame, and a mounting block adjustablycarried upon both bars to slide therel 7 along and be positionedthereby; a beam having a horizontal working position and carryingearthworking means; and mounting means retaining said beam andearthworking means on said block for movement thereon between operativeand inoperative positions and for raising and lowering with said blockand said frame by said power lift.

8. A combination as in claim '7 wherein said mounting means f or saidbeam and earthworking means includes adjusting means providing forlateral movement of rearward portions of said beam to adjust for sidedraft of said earthworking means.

9. In `combination in a two-way plow: a pair 0f oppcsitely pitched plowbottoms, plow beams respectively carrying said plow bottoms; meansinterconnecting said plow bottoms and plow beams in counterbalancedrelationship and providing for lowering one plow bottom as the other israised; Van upstanding frame; means for supporting said frame upon atractor for automatic raising and lowering of the frame by a. power lifton the tractor; a pair of parallel transverse supporting shafts mountedin the lower portion of said frame; plural mounting means mountable onsaid shafts, each mounting means being mounted on both of said shafts;and means swingingly attaching said plow beams to said mounting means.

10. In combination :in a two-way plow: an upstanding frame having meansadapted for supporting said frame upon a tractor for automaticallyraising and lowering the frame by a power lift mechanism on the tractor;a plurality of plow units; a pair of parallel, transverse supportingshafts mounted in the lower portion of said frame; a plurality ofmounting blocks each of which is movably mounted upon each of saidshafts for lateral movement therealong; and means carried by said blocksand mounting said plow units thereupon for swinging movement in verticaldirections between elevated and lowered positions.

11. In combination in a plow structure; an upstanding frame having meansadapted for supporting said frame upon a tractor for automaticallyraising and lowering of the frame by a power lift mechanism on thetractor; transverse supporting shaft means mounted in the lower portionof said upstanding frame to carry a plurality of plow units; a pluralityof mounting block. means adjustable transversely of said shaft means;and plural movable means movably carried by said block means andcarrying said plow units for movement of the latter vertically betweenelevated and lowered positions, whereby said plow units may be spacedvariably from one another along said transverse supporting shaft means.

12. A combination as in claim 1l wherein said plurality of adjustablemounting block means is arranged in pairs, and each pair thereof carriesone of said plural movable means, and beam means fixed on each of saidplural movable means and carrying respective plow units.

13. A combination as in claim 12 wherein one of said plural movablemeans carries spaced plow units swinging together with such movablemeans in vertical planes.

14. A combination as in claim 12 wherein one of said plural movablemeans carries a single beam and plow unit to swing in a vertical plane.

15. In combination in a two-way plow: an upstanding frame; means forsupporting said frame upon a tractor for automatically raising andlowering said frame by a power lift on the tor: a pair of transverseparallel supporting shafts mounted on a lower portion o-f said frame; aplurality of mounting devices, each of which is mounted on both of saidsupporting shafts; plow beams mounted upon said mounting devices toswing vertically; oppositely pitched plow bottoms carried by said beams;means interconnecting said beams and plow bottoms in counterbalancedrelation; swinging arm means mounted upon one of said shafts adjacentthe respective plow beams to swing vertically; means connecting eachswinging arm means with the respective plowlbeam to swing in unisontherewith, each swinging arm means upstanding adjacent said frame whenits plow bottom is in lowered, operative position; and pull link meansoperatively connected with each swinging arm means `and adapted forconnection with a lower portion of the tractor to pull on its swingingarm means as said frame is raised by said power lift, whereby to elevatethe respective plow bottom.

16. In combination in an earthworking structure: an upstanding frame;means for supporting said frame upon a tractor for raising and loweringof the frame by a lift on the tractor; a plurality of transversesupporting bar means carried by said frame; plural mounting meanscarried by said bar means, at least one mounting means being movablewith respect to said bar means; beam means movably carried in horizontalposition by said mounting means; earthworking means mounted upon saidbeam. means and movable with said beam means between operative andinoperative positions with respect to earth being worked; and means formoving said beam means and earthworking means between said positions.

17. In combination as in claim 16 wherein the means for moving said beammeans is swinging arm means operatively connected with said beam meansto eiect movement of said earthworking means between said operative andinoperative positions.

18. In combination in a two-way plow: oppositely pitched plow bottoms;beam means carrying said plow bottoms and having a substantiallyhorizontal working position; upstanding frame means; means forsupporting said frame means upon a tractor for raising and lowering ofthe frame means by a lift on the tractor; spaced, transverse supportingbars carried by said frame means; mounting means mounted on said spacedbars, said beam means being movably mounted on said mounting means tomove said plow bottoms between earth-engaging position andearthdisengaging position; and means to move said beam means on saidmounting means.

19. A combination as in claim 18 wherein said beam-moving means isswinging arm means operatively connected therewith.

20. In combination in an earthworking apparatus: an upstanding frame;means for supporting said frame upon a tractor for raising and loweringthereof by a lift on the tractor; a plurality of spaced transversesupporting bar means carried by said frame; a pair of mounting meanscarried by said bar means, at least one of said mounting means beingadjustable with respect to said bar means; single beam means movablycarried by said pair of mounting means to move with respect thereto;earthworking means mounted upon said beam means and movable with saidbeam means between operative and inoperative positions with respect toearth being Worked; 'and means for moving sai'd beam means andearthworking means between said positions.

21. A combination as in Claim 29 wherein said beam'` means has ahorizontal Working position and wherein said mounting means includesmeans tochange the angularity of said beamV References Cited in the leof this patent Y UNITED STATES PATENTS Number Name Date 261,176 SanbornJuly 18, 1882 341,250 Kimmell May 4, 1886 631,152 Carroll Aug. 15, 1899633,333 Beall Sept. 19, 1899 Number Number 20 Name Date *i d Heider Apr.19, 1921 Kinney June 20, 1922 Kanke Oct. 10, 1922' White Nov. 28, 1922Tapp Mar. 14, 1933 Arps June 27,1944 Noisinger Sept. 26, 1944 Mellen eta1. June 11, 1946 Rogers et al. July 15, 1947 Ferguson Mar. 16, 1948Lansing Dec. 28, 1948 Evans June 28, 1949 Mellen Nov. 14, 1950 CarlsonJuly 24, 1951 Rogers Nov. 20, 1951' FOREIGN PATENTS Country Date FranceAug. 23, 1943

